U.S. patent application number 14/620236 was filed with the patent office on 2016-06-09 for vehicle body structure.
This patent application is currently assigned to Ford Global Technologies, LLC. The applicant listed for this patent is Ford Global Technologies, LLC. Invention is credited to Randall R. Frank, Michael Luchtman, John Michael McGuckin, Chris Stephen O'Connor, Yi Qu.
Application Number | 20160159406 14/620236 |
Document ID | / |
Family ID | 56093573 |
Filed Date | 2016-06-09 |
United States Patent
Application |
20160159406 |
Kind Code |
A1 |
Qu; Yi ; et al. |
June 9, 2016 |
VEHICLE BODY STRUCTURE
Abstract
A vehicle body structure includes a side sill formed of high
strength steel and a seat cross-member formed of high strength
steel. A floor pan is welded to at least one of the side sill and
the seat cross-member. A flange includes a base extending from the
seat cross-member and a tab extending from the base. The tab is
spaced from the seat cross-member and is welded to the floor pan
and the side sill.
Inventors: |
Qu; Yi; (Troy, MI) ;
Luchtman; Michael; (Clawson, MI) ; O'Connor; Chris
Stephen; (Livonia, MI) ; McGuckin; John Michael;
(Ann Arbor, MI) ; Frank; Randall R.; (Dearborn,
MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ford Global Technologies, LLC |
Dearborn |
MI |
US |
|
|
Assignee: |
Ford Global Technologies,
LLC
Dearborn
MI
|
Family ID: |
56093573 |
Appl. No.: |
14/620236 |
Filed: |
February 12, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62089679 |
Dec 9, 2014 |
|
|
|
Current U.S.
Class: |
296/193.02 |
Current CPC
Class: |
B62D 25/025 20130101;
B62D 25/2036 20130101; B62D 29/007 20130101 |
International
Class: |
B62D 25/20 20060101
B62D025/20; B62D 29/00 20060101 B62D029/00; B62D 25/02 20060101
B62D025/02 |
Claims
1. A vehicle body structure comprising: a side sill formed of high
strength steel; a seat cross-member formed of high strength steel;
and a floor pan welded to at least one of the side sill and the
seat cross-member; a flange including a base extending from the
seat cross-member and a tab extending from the base, the tab being
spaced from the seat cross-member and welded to the floor pan and
the side sill.
2. The vehicle body structure as set forth in claim 1 wherein the
floor pan is disposed between the tab and the side sill.
3. The vehicle body structure as set forth in claim 1 wherein the
base of the flange is welded to the side sill.
4. The vehicle body structure as set forth in claim 1 wherein the
flange is integrally formed with the seat cross-member.
5. The vehicle body structure as set forth in claim 1 wherein the
tab extends from the base to an end spaced from the base.
6. The vehicle body structure as set forth in claim 5 wherein the
tab is welded to the floor pan between the base and the end of the
tab.
7. The vehicle body structure as set forth in claim 5 wherein the
end of the tab is 15-18 mm from the base.
8. The vehicle body structure as set forth in claim 1 wherein the
floor pan is formed of mild steel.
9. The vehicle body structure as set forth in claim 1 wherein the
floor pan is formed of cold rolled steel.
10. The vehicle body structure as set forth in claim 1 wherein the
floor pan is 0.6-0.7 mm thick.
11. The vehicle body structure as set forth in claim 1 wherein the
side sill is formed of dual phase steel.
12. The vehicle body structure as set forth in claim 1 wherein the
side sill is 1.25-1.75 mm thick.
13. The vehicle body structure as set forth in claim 1 wherein the
seat cross-member is formed of dual phase steel.
14. The vehicle body structure as set forth in claim 1 wherein the
seat cross-member is formed of high-strength low alloy steel.
15. The vehicle body structure as set forth in claim 1 wherein the
seat cross-member is 1.0-1.3 mm thick.
16. The vehicle body structure as set forth in claim 1 wherein the
side sill and the seat cross-member are formed of dual phase
steel.
17. The vehicle body structure as set forth in claim 1 wherein the
floor pan is 0.6-0.7 mm thick, the side sill is 1.25-1.75 mm thick,
and the seat cross-member is 1.0-1.3 mm thick.
18. The vehicle body structure as set forth in claim 1 wherein the
floor pan is formed of mild steel, and wherein the side sill and
the seat cross-member are formed of dual phase steel.
19. The vehicle body structure as set forth in claim 1 wherein the
flange is formed from the same type of material as the seat
cross-member.
20. A vehicle body structure comprising: a side sill formed of high
strength steel and being 1.25-1.75 mm thick; a seat cross-member
formed of high strength steel and being 1.0-1.3 mm thick; and a
floor pan formed of mild steel and being 0.6-0.7 mm thick and being
welded to at least one of the side sill and the seat cross-member;
a flange integrally formed with the seat cross-member, the flange
including a base extending from the seat cross-member and a tab
extending from the base, the tab being spaced from the seat
cross-member and welded to the floor pan and the side sill.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The subject patent application claims priority to and all
the benefits of U.S. Provisional Patent Application No. 62/089,679
filed on Dec. 9, 2014, which is herein incorporated by reference in
its entirety.
BACKGROUND
[0002] A body structure of a vehicle includes a pair of side sills,
positioned on the right side and left side of the vehicle, seat
cross-members extending between the side sills, and a floor pan
extending beneath the seat cross-members between the side sills.
The seat cross-members are welded to the side sills and are welded
to the floor pan. The floor pan is welded to the side sills. A weld
span without welds between the side sills and the floor pan exist
along the seat cross-members. In other words, the seat
cross-members restrict access to the interface between the side
sills and the floor pan along the seat cross-members, such that no
welds are made between the side sills and the floor pan along the
seat cross-members. This weld span without welds along the seat
cross-members may be between 165-185 mm.
[0003] During vehicle crash testing, e.g., small offset rigid
barrier tests, side impact tests, etc., the welds between the floor
pan and the side sills are subjected to forces. The welds between
the floor pan and the side sills adjacent the seat cross-members
may be subjected to the highest forces and, as such, a higher
opportunity for separation between the floor pan and the side sills
may occur in this area during crash testing. When the side sills
and the seat cross-members are formed of mild steel, the mild steel
may be stamped and trimmed in ways to increase the interaction and
welds between the side sills and the floor pan in the area of the
seat cross-members to reduce the possibility of separation between
the floor pan and the side sills during crash testing.
[0004] High strength steels are being used increasingly in the
formation of the side sills and the seat cross-members. The
material characteristics of the high strength steel allows the side
sills and the floor pan formed of high strength steel to be
thinner, i.e., lower gage, than the same side sills and floor pan
made from mild steel. As such, the use of high strength steel
allows for the side sills and floor pan to be made thinner, and
thus lighter, to aid in improving fuel economy of the vehicle.
However, high strength steel is less workable than mild steel. As
such, there remains an opportunity to design a body structure
having side sills and seat cross-members formed of high strength
steel and that reduces the possibility of separation between the
floor pan and the side sills during crash testing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 is a perspective view of a body structure of a
vehicle including a seat cross-member and a seat pan welded to side
sills;
[0006] FIG. 2 is perspective view of a portion of the body
structure including the seat cross-member and the seat pan welded
to one of the side sills;
[0007] FIG. 3 is a perspective view of a portion of the body
structure before welding;
[0008] FIG. 4 is another perspective view of a portion of the body
structure before welding;
[0009] FIG. 5 is a perspective view of a second embodiment of the
body structure; and
[0010] FIG. 6 is a perspective view of a third embodiment of the
body structure.
DETAILED DESCRIPTION
[0011] With reference to the Figures, wherein like numerals
indicate like parts throughout the several views, a first
embodiment of a body structure 10 of a vehicle is shown in FIGS.
1-4. The body structure 10 includes a side sill 12 formed of high
strength steel, a seat cross-member 14 formed of high strength
steel, and a floor pan 16 welded to at least one of the side sill
12 and the seat cross-member 14. A flange 18 includes a base 20
extending from the seat cross-member 14 and a tab 22 extending from
the base 20. The tab 22 is spaced from the seat cross-member 14 and
is welded to the floor pan 16 and the side sill 12.
[0012] Since the tab 22 is welded to the floor pan 16 and the side
sill 12, this configuration advantageously reinforces the
connection between the floor pan 16 and the side sill 12. In
particular, the increased number of welds 24 and the location of
the weld 24 that is located on the flange 18 reduces the weld-less
span along the seat cross-members 14 to increase the strength of
the connection between the floor pan 16 and the side sill 12. This
reduces the likelihood of separation of the floor pan 16 and side
sill 12 during crash tests of the vehicle, e.g., high speed offset
crash tests such as small offset rigid barrier (SORB) tests, side
impact tests, etc.
[0013] With reference to FIG. 1, the body structure 10 may include
a pair of side sills 12 spaced from each other. The side sills 12
may extend longitudinally between a front of the vehicle and a rear
of the vehicle. One of the side sills 12 may be positioned along a
left side of the vehicle and the other of the side sills 12 may be
positioned along a right side of the vehicle. The floor pan 16 may
extend from one side sill 12 to the other side sill 12 and may be
welded to both side sills 12. The side sills 12 may have a tubular
cross-section, as shown in FIGS. 2-4.
[0014] With continued reference to FIG. 1, the body structure 10
may include two seat cross-members 14. However, it should be
appreciated that the body structure 10 may include any suitable
number of seat cross-members 14. Only one end of the seat
cross-members 14 is shown in the Figures, however, it should be
appreciated that each seat cross-member 14 may extend from one side
sill 12 to the other side sill 12. In such a configuration, the
ends of the seat cross-member 14 may be mirror images of each other
to be welded to both of the two seat cross-members 14.
[0015] Each end of the seat cross-member 14 may include a pair of
flanges 18, as shown in FIG. 1, spaced from each other along the
side sill 12 on opposite sides of the seat cross-member 14. These
flanges 18 may be mirror images of each other.
[0016] With reference to FIGS. 2-4, the floor pan 16 is disposed
between the tab 22 and the side sill 12. As such, the floor pan 16
is welded between the tab 22 and the side sill 12, as shown in FIG.
2. This configuration advantageously pinches the floor pan 16
between the side sill 12 and the tab 22 to reinforce the connection
between the floor pan 16 and the side sill 12.
[0017] The base 20 of the flange 18 may abut the side sill 12. As
shown in FIG. 1, the base 20 of the flange 18 may be welded to the
side sill 12.
[0018] The flange 18 may be formed of the same type of material as
the seat cross-member 14. The flange 18 may integrally formed with
the seat cross-member 14. In other words, the flange 18 may be
formed simultaneously with the seat cross-member 14 as a single
continuous unit. Specifically, the seat cross-member 14 and the
flange 18 may be formed from a single piece of material that is
stamped and trimmed with dies. Alternatively, the flange 18 may be
formed separately from the cross-member 14 and subsequently fixed
to the cross-member 14.
[0019] With reference to FIGS. 2-4, the tab 22 extends from the
base 20 to an end 26 spaced from the base 20. A gap 38 is defined
between the tab 22 and the seat cross-member 14. The gap 38 may
extend along the flange 18 from the base 20 to the end 26. The end
26 of the tab 22 is cantilevered relative to the base 20. The tab
22 is welded to the floor pan 16 between the base 20 and the end 26
of the tab 22. The tab 22, for example, may extend 15-18 mm from
the base 20.
[0020] The floor pan 16 may define a bottom 28 and a lip 30
extending from the bottom 28. The lip 30 may be welded to the side
sill 12 at welds 24, as shown in FIG. 2. The lip 30 may extend
upwardly at a right angle relative to the bottom 28, as shown in
FIGS. 1-4. It should be appreciated that the floor pan 16 may
include one or more lips 30 welded to any number of side sills
12.
[0021] The side sills 12 and/or the seat cross-member 14 may be
formed of a type of metal that is stronger than a type of metal of
the floor pan 16. For example, the type of metal of the side sills
12 and/or the seat cross-member 14 may have a higher yield strength
and/or higher toughness than the type of metal of the floor pan 16.
As set forth further below, since the lip 30 of the floor pan 16 is
pinched and welded between one of the side sills 12 and flange 18,
the stronger type of material of the floor pan 16 and/or the flange
18 reinforces the floor pan 16.
[0022] The floor pan 16 may be formed of mild steel, e.g., low
carbon formable steel, coated or uncoated, hot or cold-rolled
steel, with yield strength less than 240 MPa (35 ksi) (grade levels
of low carbon sheet steels may be classified by SAE J2329
document). As one example, the floor pan 16 may be formed of CR 210
steel. Alternatively, the floor plan 16 may be formed of any
suitable type of steel. The floor pan 16 may be 0.6-0.7 mm thick,
e.g., 0.67 mm thick. The thickness of the seat floor pan 16 may be
constant.
[0023] As set forth above, the side sills 12 may be formed of
high-strength steel e.g., steel that is hot or cold-rolled sheet,
uncoated or coated, with yield strength equal or greater than 240
MPa (35 ksi) (the grades (SAE J2340) and strength levels may be
achieved through chemical composition and special processing). For
example, the side sills 12 may be formed of dual phase steel. As
one example, the side sills 12 may be formed of DP 600 steel.
Alternatively, the side sills 12 may be formed of any suitable type
of steel. The side sills 12, for example, may be 1.25-1.75 mm
thick, e.g., 1.5 mm thick. The thickness of the side sills 12 may
be constant.
[0024] The seat cross-member 14 and the flanges 18 may be formed of
high-strength steel. For example, the seat cross-members 14 and the
flanges 18 may be formed of dual phase steel. As one example, the
seat cross-members 14 and the flanges 18 may be formed of DP 780
steel. As another example, the seat cross-members 14 and the
flanges 18 may be formed of a high-strength low alloy steel, such
as HSLA 300 steel. Alternatively, the seat cross-members 14 and the
flanges 18 may be formed of any suitable type of steel.
[0025] The seat cross-member 14 and the flanges 18 may have a
common thickness. The thickness of the seat cross-member 14 and the
flange 18 may be constant. The seat cross-member 14 and the flanges
18, for example, may be between 1.0-1.3 mm thick. For example, the
seat cross-members 14 and the flanges 18 may be formed of DP 780
steel that is 1.1 mm thick. As another example, the seat
cross-members 14 and the flanges 18 may be formed of HSLA 300 steel
that is 1.2 mm thick.
[0026] The seat cross-members 14 may include another flange 32
welded to the side sill 12. The flange 32 may be elongated along a
longitudinal direction of the side sill 12 and the line of welds 24
along the flange 32 may extend along the longitudinal direction of
the side sill 12. The seat cross-members 14 may include
longitudinal flanges 34 extending along the floor pan 16 and welded
to the floor pan 16. The flanges 32, 34 may be integrally formed
with the rest of the seat cross-member 14.
[0027] With reference to FIG. 1, the welds 24 between the floor pan
16, seat cross-members 14, side sills 12, and flange 18 may be spot
welds. The spot welds may be 3T welds.
[0028] In operation, the weld 24 at the tab 22 of the flange 18
pinches the lip 30 of the floor pan 16 between the tab 22 and the
side sill 12. The tab 22 and the side sill 12, being formed of a
type of metal stronger than the type of metal of the floor pan 30,
reinforce the lip 30 of the floor pan 16 to assist in limiting
and/or preventing separation between the side sill 12 and the floor
pan 16 during a vehicle collision, e.g., a SORB test, side-impact
test, etc. During such a vehicle collision, the shear force on the
weld 24 at the tab 22 is more than two times higher than the shear
force on the adjacent weld 24. This weld 24 at the tab 22 resists
this shear force to assist in limiting and/or preventing separation
between the side sill 12 and the floor pan 16 during the vehicle
collision.
[0029] A second embodiment of the body structure 210 is shown in
FIG. 5. The second embodiment of the body structure 10 includes a
flange reinforcement 236 welded to the lip 30 of the floor pan 16
and the side sill 12. The lip 30 of the floor pan 16 may be
disposed between the flange reinforcement 236 and the side sill 12.
The flange reinforcement 236 effectively increases the width of the
lip 30 to assist in limiting and/or preventing separation between
the side sill 12 and the floor pan 16 during a vehicle collision.
The flange reinforcement 236 may be, for example, formed of
high-strength low alloy steel. As one example, the flange
reinforcement 236 may be formed of HSLA 340 and may be 1.0 mm
thick.
[0030] A third embodiment of the body structure 310 is shown in
FIG. 6. In the third embodiment, the thickness of the floor pan 316
is 1.0-1.5 mm thick, e.g., 1.25 mm thick. In such an embodiment,
the floor pan 316 may be formed of mild steel and the increased
thickness of the floor pan 316 assists in limiting and/or
preventing separation between the side sill 12 and the floor pan 16
during a vehicle collision
[0031] The disclosure has been described in an illustrative manner,
and it is to be understood that the terminology which has been used
is intended to be in the nature of words of description rather than
of limitation. Many modifications and variations of the present
disclosure are possible in light of the above teachings, and the
disclosure may be practiced otherwise than as specifically
described.
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